Alert archive / Texas / Mesoscale Discussions in 2011

Mesoscale Discussion 2241

October 9, 201127 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 9, 2011, 2:40 AM CDT for 27 counties in Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Oct 9, 2011, 2:40 AM CDT (07:40 UTC)
Expired: Oct 9, 2011, 5:45 AM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 27 counties

Atascosa County, TX, Bee County, TX, Bexar County, TX, Blanco County, TX, Burnet County, TX, Caldwell County, TX, Comal County, TX, Duval County, TX, Frio County, TX, Goliad County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Jim Wells County, TX, Karnes County, TX, Kendall County, TX, Kleberg County, TX, La Salle County, TX, Live Oak County, TX, Llano County, TX, McMullen County, TX, Medina County, TX, Nueces County, TX, San Patricio County, TX, Travis County, TX, Webb County, TX, Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 54 km from the middle of the area, began a volume at 07:40 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 7.7 hours before the alert went out and 198 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2637 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 842 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 8, 11:32 PM CDT	Mesoscale Discussion	SPC	Bandera, Blanco, Bosque, Brown, Burnet, Comanche and 25 more	2 hr
Oct 9, 7:53 AM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Brazos, Burleson, Calhoun, Colorado and 18 more	3 hr

Nearby

Mesoscale Discussions in Texas, 2011 Every mesoscale discussion in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.